In its amended S-1 filed today with the Securities and Exchange Commission, Facebook breaks down the details of its $1 billion purchase of Instagram earlier this month, revealing that it's paying $300 million in cash and the rest in stock.

The basic terms of the deal had been reported by The New York Times, but now we see the official numbers. In addition to the $300 million in cash, Facebook is paying 23 million shares of common stock, valued at $30.89. All told, that comes to about $1 billion -- although the value will vary depending on what happens with Facebook's stock once it goes public.

Already, more and more people are using Facebook via a mobile devices, be them smartphones or tablets. The latest S-1 says that Facebook's monthly active mobile users -- people who access Facebook from a mobile device once a month -- stood at 488 million in March. As of April 20th, that figure climbed past 500 million.

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Paul Sloan is editor in chief of CNET News. Before joining CNET, he had been a San Francisco-based correspondent for Fortune magazine, an editor at large for Business 2.0 magazine, and a senior producer for CNN. When his fingers aren't on a keyboard, they're usually on a guitar. Email him here.
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